Android Espresso: PerformException

Question

I`m getting

android.support.test.espresso.PerformException: Error performing \'send keyCode: 4, metaState: 0 key event\' on view \'Animations or tra

Answer 1

In my case, Espresso gave me the "Animations or transitions are not enabled..." error, but that wasn't actually the root cause.

Scrolling through the stack trace I found this:

androidx.test.espresso.PerformException: Error performing 'scroll to' on view 'Animations or transitions are enabled on the target device.

...

Caused by: java.lang.RuntimeException:
  Action will not be performed because the target view does not match one or more
  of the following constraints:
    (view has effective visibility=VISIBLE and is descendant of a: (
      is assignable from class: class android.widget.ScrollView or
      is assignable from class: class android.widget.HorizontalScrollView or
      is assignable from class: class android.widget.ListView
    ))
Target view: "LinearLayout{...}"

That is, I was trying to scroll something that can't be scrolled.

So, always read through the stacktrace folks